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Neuropathic Pain the Pharmacological Management of Neuropathic Pain in Adults in Non-Specialist Settings

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Neuropathic Pain the Pharmacological Management of Neuropathic Pain in Adults in Non-Specialist Settings Neuropathic pain The pharmacological management of neuropathic pain in adults in non-specialist settings NICE clinical guideline Draft for consultation, September 2011 This guideline was developed following the NICE short clinical guideline process. This document includes all the recommendations, details of how they were developed and summaries of the evidence they were based on. Neuropathic pain: NICE clinical guideline DRAFT September 2011 1 of 150 Contents Introduction ...................................................................................................... 3 Drug recommendations ................................................................................ 5 Who this guideline is for ............................................................................... 6 Patient-centred care ......................................................................................... 7 1 Recommendations .................................................................................... 8 The following definitions apply to this guideline. ........................................... 8 List of all recommendations .......................................................................... 8 2 Care pathway .......................................................................................... 15 3 Evidence review and recommendations .................................................. 18 3.1 Methodology ..................................................................................... 18 3.2 Painful diabetic neuropathy (PDN) .................................................... 30 3.3 Post-herpetic neuralgia (PHN) .......................................................... 65 3.4 Other neuropathic pain conditions .................................................... 85 4 Notes on the scope of the guideline ...................................................... 131 5 Implementation ...................................................................................... 131 6 Other versions of this guideline ............................................................. 131 6.1 Quick reference guide ..................................................................... 131 6.2 NICE pathway ................................................................................. 131 6.3 ‘Understanding NICE guidance’ ...................................................... 132 7 Related NICE guidance ......................................................................... 132 8 Updating the guideline ........................................................................... 132 9 References ............................................................................................ 133 10 Glossary and abbreviations ................................................................ 143 Appendix A Contributors and declarations of interests ................................ 146 Appendices 10.1 to 10.11 are in separate files. Neuropathic pain: NICE clinical guideline DRAFT September 2011 2 of 150 This clinical guideline updates and replaces the following recommendations on the drug treatment of painful diabetic neuropathy in previous NICE clinical guidelines: recommendations 1.11.5.2, 1.11.5.3, 1.11.5.4, 1.11.5.5 and 1.11.5.7 in ‘Type 1 diabetes: diagnosis and management of type 1 diabetes in children, young people and adults’ (NICE clinical guideline 15) recommendations 1.14.2.3, 1.14.2.4, 1.14.2.5 and 1.14.2.6 in ‘Type 2 diabetes: the management of type 2 diabetes’ (NICE clinical guideline 87). Introduction Pain is an unpleasant sensory and emotional experience that can have a significant impact on a person’s quality of life, general health, psychological health, and social and economic well-being. The International Association for the Study of Pain (IASP 2011) defines: neuropathic pain as ‘pain caused by a lesion or disease of the somatosensory nervous system’. This is further delineated as central neuropathic pain ‘pain caused by a lesion or disease of the central somatosensory nervous system’, and peripheral neuropathic pain ‘pain caused by a lesion or disease of the peripheral somatosensory nervous system’. Neuropathic pain is very challenging to manage because of the heterogeneity of its aetiologies, symptoms and underlying mechanisms (Beniczky et al. 2005). Examples of common conditions that have peripheral neuropathic pain as a symptom are painful diabetic neuropathy, post-herpetic neuralgia, trigeminal neuralgia, radicular pain, pain after surgery and neuropathic cancer pain (that is, chemotherapy-induced neuropathy and neuropathy secondary to tumour infiltration). Examples of conditions that can cause central neuropathic pain include stroke, spinal cord injury and multiple sclerosis. Neuropathic pain can be intermittent or constant, and spontaneous or provoked. Typical descriptions of the pain include terms such as shooting, stabbing, like an Neuropathic pain: NICE clinical guideline DRAFT September 2011 3 of 150 electric shock, burning, tingling, tight, numb, prickling, itching and a sensation of pins and needles. People may also describe symptoms of allodynia (pain caused by a stimulus that does not normally provoke pain) and hyperalgesia (an increased response to a stimulus that is normally painful) (McCarberg 2006). A review of the epidemiology of chronic pain found that there is still no accurate estimate available for the population prevalence of neuropathic pain (Smith and Torrance 2010). For example, the prevalence of neuropathic pain overall has been estimated at between 1% and 2%, based on summed estimates of the prevalence in the USA (Bennett 1997) and the UK (Bowsher et al. 1991). These estimates of population prevalence came from a number of heterogeneous studies of variable validity, are likely to be inaccurate and are inconsistent. Other condition-specific studies have also mirrored the heterogeneous nature of neuropathic pain. For example, painful diabetic neuropathy is estimated to affect between 16% and 26% of people with diabetes (Jensen et al. 2006; Ziegler 2008). Prevalence estimates for post- herpetic neuralgia range from 8% to 19% of people with herpes zoster when defined as pain at 1 month after rash onset, and 8% when defined as pain at 3 months after rash onset (Schmader 2002). The development of chronic pain after surgery is also fairly common, with estimates of prevalence ranging from 10% to 50% after many common operations (Shipton 2008). This pain is severe in between 2% and 10% of this subgroup of patients, and many of the clinical features closely resemble those of neuropathic pain (Jung et al. 2004; Mikkelsen et al. 2004; Kehlet et al. 2006). Furthermore, a study of 362,693 computerised records in primary care from the Netherlands estimated the annual incidence of neuropathic pain in the general population to be almost 1% (Dieleman et al. 2008). This considerable variability in estimates of the prevalence and incidence of neuropathic pain and similar conditions from general population studies is likely to be because of differences in the definitions of neuropathic pain, methods of assessment and patient selection (Smith and Torrance 2010). Neuropathic pain: NICE clinical guideline DRAFT September 2011 4 of 150 Currently, a number of pharmacological treatments are commonly used in the UK to manage neuropathic pain in non-specialist settings. However, there is considerable variation in practice in terms of how treatment is initiated, whether therapeutic doses are achieved and whether there is correct sequencing of therapeutic classes. This may lead to inadequate pain control, with considerable morbidity. In the context of this guideline, non-specialist settings are defined as primary and secondary care services that do not provide specialist pain services. These include general practice, general community care and hospital care. Commonly used pharmacological treatments include antidepressants (tricyclic antidepressants [TCAs], selective serotonin reuptake inhibitors [SSRIs] and serotonin–norepinephrine reuptake inhibitors [SNRIs]), anti-epileptic (anticonvulsant) drugs (such as gabapentin, pregabalin and carbamazepine), topical treatments (such as capsaicin and lidocaine) and opioid analgesics. All of these drug classes are associated with disadvantages, as well as potential benefits. A further issue is that a number of commonly used treatments (such as amitriptyline) are unlicensed for treatment of neuropathic pain, which may limit their use by practitioners. There is also uncertainty about which drugs should be used initially (first-line treatment) for neuropathic pain, and the order (sequence) in which the drugs should be used. This short clinical guideline aims to improve the care of adults with neuropathic pain by making evidence-based recommendations on the pharmacological management of neuropathic pain in non-specialist settings. A further aim is to ensure that those people who require specialist assessment and interventions are referred appropriately and in a timely fashion to a specialist pain service and/or other condition-specific services. Drug recommendations For all drugs, recommendations are based on evidence of clinical and cost effectiveness and reflect whether their use for the management of neuropathic pain is a good use of NHS resources. This guideline should be used in conjunction with clinical judgement and decision-making appropriate for the individual patient. Neuropathic pain: NICE clinical guideline DRAFT September 2011 5 of 150 The guideline will assume that prescribers
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